Had two of these, both stop being able to do high mode after the batteries have been used for like half hour - one hour. And theres a loud is humming noise on low mode, then after the batterie is used for for 1-2 hours it stops turning on at all. My dad and I both had one and they both did this, they sent us two replacements and they did the same.
Shame well made torch but terrible driver that cuts out far to early on used batteries…